The KEF Reference 8b Subwoofer is a high-performance, audiophile-grade active subwoofer designed to deliver deep, powerful, and distortion-free bass for premium stereo and home theatre systems. Hand-built in the UK, it utilises two long-throw 9-inch drivers housed back-to-back in a heavily braced, acoustically inert cabinet — a force-cancelling configuration that dramatically reduces cabinet vibration and delivers precise low-frequency control. Each driver is powered by its own 500 W Class D amplifier with an advanced switched-mode power supply and DSP-based control, allowing the 8b to produce effortless and authoritative bass with minimal distortion. With a frequency range extending to 18 Hz (–6 dB), a peak sound pressure output of 110 dB, and comprehensive input options including balanced XLR, RCA, and speaker-level connections, this subwoofer integrates seamlessly into high-end audio systems. Finished in Deep Piano Black High Gloss, the Reference 8b couples refined aesthetics with advanced engineering to satisfy both critical listeners and cinematic bass enthusiasts alike.
Features
- Twin 9″ Long-Throw Drivers: Force-cancelling dual drivers for deep, authoritative bass with minimal distortion.
- 2 × 500 W Class D Amplifiers: Dedicated amplifiers with DSP control for precise power delivery.
- Force-Cancelling Sealed Cabinet: Acoustically inert, heavily braced enclosure for clean low-frequency performance.
- Variable Low-Pass Filter & LFE Mode: Adjustable crossover frequency and filter slopes for seamless integration with systems.
- Multiple Input Options: Balanced XLR, RCA phono, and speaker-level inputs for versatile connectivity.
- High Output Capability: 110 dB peak sound pressure level delivering impactful, room-filling bass.
Specifcations
| Specification | Details |
|---|---|
| Weight | 34 kg (75 lbs.) |
| Dimensions (H × W × D) | 398 × 365 × 429 mm (15.7 × 14.4 × 16.8 in.) |
| Finishes | Deep Piano Black |
| Inputs | RCA phono sockets Analog XLR socket Speaker level inputs |
| Link Out | RCA phono socket |
| Frequency Range | Free Field: 18 Hz (–6 dB) |
| Frequency Response | 24 Hz at 90 dB output in free-space mode (±3 dB) |
| Net Internal Volume | 23 L |
| Maximum Output | 110 dB (peak SPL at 1 m, 50 Hz) |
| Amplifier Type | 2 × 500 W Class D with switched-mode power supply and DSP-based control section |
| Drive Units (LF) | 2 × 225 mm (9 in.) |
| Variable Low Pass Filter | Variable frequency: 40 Hz – 160 Hz Variable slope: 12 dB/oct, 18 dB/oct, 24 dB/oct LFE mode: 350 Hz, 18 dB/oct |
| Power Requirements | 100 V – 120 V / 220 V – 240 V ~ 50/60 Hz |
| Power Consumption | 1000 W |
T1S8M0E00/00-BKM
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